my Toyota Highlander Fourth Generation (2020-present) feels like it’s slipping out of gear what coul...

Solution

1. Preparation

• Gather tools and materials: OBD-II scanner, socket set, fluid catch pan, replacement transmission fluid, and rags.
• Ensure the vehicle is parked on a level surface, and set the parking brake.
• Disconnect the battery to prevent electrical shorts.

2. Check and Change Transmission Fluid

• Step 1: Remove the transmission dipstick (if applicable).
  • Inspect fluid level; add fluid if low.
• Step 2: If fluid is dirty or burnt, proceed to change it.
  • Place a fluid catch pan under the transmission pan.
  • Remove the transmission pan bolts using a socket set.
  • Carefully lower the transmission pan and drain the old fluid.
• Step 3: Replace the filter (if applicable).
  • Remove the old filter and install the new one.
• Step 4: Reinstall the transmission pan.
  • Clean the mating surfaces and apply new gasket material as needed.
  • Torque the pan bolts to the manufacturer’s specifications (usually around 10-12 ft-lbs).
• Step 5: Refill the transmission with new fluid through the dipstick tube.
  • Use the manufacturer's recommended transmission fluid type.

3. Inspect and Repair Transmission Components

• Step 1: Check the transmission linkage and adjust if necessary.
• Step 2: Replace any worn or damaged cables.
• Step 3: If TSBs indicate a software update, use the OBD-II scanner to perform the update.